Correspondences
| A Correspondence To/From Madeira, 1793-1859, all foreign |
| The American Bible Society Correspondence, 1817-1853 (mostly ship) |
| The Shearman Correspondence, 1851-1864 |
| Frank D. Williams Correspondence (Hong Kong,Marseilles), 1854-1856 |
| T. W. House, Britain to Texas Correspondence, 1858-1870 |
Forwarding Agents
| Forwarding Agents, 1818-1873 |
| Forwarding Agents, 1824-1889 |
| Forwarding Agents, 1839-1886 |
| Forwarding Agents - Harnden Company, 1841-1848 |
U.S. Naval Covers
| US Naval Covers - U.S.S. Kearsarge |
| Oscar H. Lackey Naval Correspondence, 1869-1875 |
| US Naval Covers, mostly ship, 1815-1844 |
| US Naval Covers, a few ship, 1835-1905 |
| US Naval Covers, some ship, steam, 1826-1863 |
Ship Letters
| Miscellaneous Ship Letters, 1746-1867 |
| Miscellaneous Ship Letters, 1794-1882 |
| Ship Letters, 1807-1868 (not Baltimore, Boston, NY, Philadelphia) |
| Miscellaneous Stampless Ship Letters |
| Philadelphia Letters 1801-1873 (inbound ship, outbound Cope's) |
| New York Ship Letters, 1793-1840 |
| New York Ship Letters, 1828-1908 |
| Boston Ship Letters, 1770-1854 |
| Boston Ship/Packet Letters (1799, 1843-1866 all stampless) |
| Boston Ship Letters, 1816-1849 |
| Boston Ship Letters, 1823-1895 |
| Ship and Inland Waterways, 1828-1864, mostly steam |
Steam Ship Lines
| Hamburg-American Line (HAPAG), 1855-1937 |
| S. S. Robert Fulton - Pioneer Steamships, 1821-1822 |
| Smaller Transatlantic Steamship Lines, 1853-1926 |
| Pioneer Steamships, 1838-1840 - Royal William, Sirius, British Queen |
| S. S. Great Western - The Great Western Steamship Company, 1838-1840 |
| The Inman Line, 1851-1885 |
| The Inman Line, 1858-1882 |
| The Guion Line, 1870-1893 |
| Transatlantic Mails to/from Canada, 1824-1891 |
| Transatlantic Steam Co. - Ocean, Atlantic, National, French, 1847-1905 |
| Havre Line, Old Line, Union Line - Pioneer Sailing Packets, 1831-1844 |
| Various Lines, Pioneer Sailing Packets, 1798-1851 |
| Black Ball Line, Pioneer Sailing Packets, 1809-1847 |
| Falmouth Packets, 1791-1837 |
| Pioneer Sailing Packets - Swallow Tail Lines, 1833-1854 |
| New York & Havre Steam Navigation Company, 1850-1861 |
| Great Western Steam Ship Co., 1841-1846 (pioneer British steamships) |
| Montreal Ocean Steam Ship Co - The Allan Line, 1857-1902 |
| Transatlantic Steam Ship Co - S. S. Liverpool, 1838-1840 |
| White Star Line, 1873-1920 |
BNA Mails
| US/Canada Cross Border Rates, 1813-1866 |
| New Brunswick, PEI, Newfoundland and Nova Scotia, 1817-1867 |
West Indies and South American Mails
| West Indies Mail, almost no US Markings, 1836-1906 |
| West Indies and South American Mail, 1845-1926, all foreign (French) |
| West Indies and South American Mail, 1848-1875, all US |
| West Indies and South American Mail without US Markings, 1852-1875 |
| West Indies and South American Mail - Brazil and Argentina, 1855-1866 |
| West Indies and South American Mail, 1859-1877, mostly foreign |
| West Indies and South American Mail, 1860-1936, mostly US |
| West Indies and South American Mail, 1862-1936, some US |
| South American Mail, mostly Buenos Aries, 1867-1882 |
French Mails
| French Mails without US Markings, 1819-1863 |
| French Mails (stampless) - 1825-47 - Union and Havre Lines |
| French Mails - Mediterranean & North Africa,1835-1878 |
| French Mails without US Markings, 1837-1882 |
| French Mails before French Treaty, 1838-1857 |
| French Mails without US Markings 1840-1941 |
| French & some Spanish Mails,1853-1939 |
| French Mails from April 1, 1857 Treaty to 1867 Period |
| French Mails - 1859-1874, Treaties 4/1/57,1/9/69,1/1/70 and 9/1/71 |
British Mails - Cunard Line
| Cunard Line - 1840-1880 |
| Cunard Line - British Packet Letters, 1840-1895 |
| Cunard Line - British Packet Letters, 1841-1893 |
| Cunard Line - 1841-1929 |
| Cunard Line - British Packet Letters, 1841-1852 |
| Cunard LIne - Reprisal, Retaliatory, Restored and Treaty Rates 1847-1849 |
| Cunard Line - R.M.S. Arabia, Asia and America, 1851-1866 |
| Cunard Line (plus few Collins Line), 1854-1867 |
British Mails
| British Postal Markings, mostly SHIP LETTER or India, 1768-1887 |
| British Ship Letter Markings (almost no U.S. markings), 1788-1902 |
| British Packet Letters, 1800-1940 (a real mix of information) |
| British Mails - non-Cunard, 1840-1849 |
| The Straight Line British "BOSTON" Marking, 1842-1844 |
| Irish Mails - Irish Potato Famine 1847-1851 |
| Various Transatlantic, 1849-1878 (few later) |
| Various Transatlantic, 1863-1913, mostly 1880s+, mostly stamped |
German Mails
| German Mails, 1835-1875 |
| German Mails, 1859-1875 |
| German Mails - North German Lloyd Line, 1860-1935 |
Other European Mails
| Russian Mail, 1838-1873, all foreign |
| To/From Switzerland, 1851-1904 and Italy/Roman States, 1846-1874 |
| Belgium and Netherlands Mail, 1834-1878 |
| A Correspondence To/From Madeira, 1793-1859, all foreign |
Australian Mails
| Australian Mails, 1849-1857 |
| European and Australian Royal Mail Company, 1856-1857 |
| Australian Mails, 1857-1859 |
| Australian Mails, 1859-1909 |
| Australia & New Zealand to the UK via Panama, 1866-1868 |
India and Far East Mails
| Peninsular & Oriental Steam Navigation Co - India and Areas, 1839-1886 |
| Peninsula & Oriental Steam Navigation Co - India and Singapore, 1845-1905 |
| Peninsula & Oriental Steam Navigation Co - India, 1888-1914 |
| China and Hong Kong Mails, 1841-1872 |
| Frank D. Williams Correspondence (Hong Kong,Marseilles), 1854-1856 |
| China and Hong Kong Mails (mostly P&O), 1858-1903 |
| Transpacific Mail, 1864-1935 |
| Transpacific Mail, 1872-1910 |
| Transpacific Mail, 1881-1938 |